bug: undo for arrow translation of x1,y1 not working

[meetzaveri]

When I select arrow, and when I change x1,y1 of arrow and then press undo , it doesn't revert back to old x1,y1 values. [DONE]

[meetzaveri]

Another bug: For any elements/shapes/pencil, if I change opacity, and then press undo, it doesn't work.